Question

sabendo que x/y=9/4 e x-y =15,o valor de x+y é
a)37
b)40
c)39
d)41

Answer 1

x/y=9/4
x-y =15

9y=4x
x=15+y

9y = 4 *(15+y)
9y = 60 + 4y
9y - 4y = 60
5y = 60
y = 60/5
y = 12

9 * 12 = 4x
4x = 108
x = 108/4
x = 27